There's no BlackBerry created mechanism or app for going back. You could look at third-party tools or manual options, but yeah, nothing BlackBerry provided for doing so.

Not entirely correct. Device Switch for BlackBerry 10 and Device Switch on the Priv works great. I go back and forth when I get bored of my Passport, Classic and Priv. I am crazy that way. Just set the Priv as the 'Android Device' and voila. You can go from Priv fairly seamlessly back to Passport

Thank you guys. You're awesome
I feel I'm having the best of both worlds. I get to keep my passport and Priv going back and forth.
Still trying to figure if Priv has a way to close an app with a swipe as opposed to closing it out from the widget.